<template>
  <my-search @click="gotoSearch"></my-search>
  <view class="scroll-view-container">
    <!-- 左侧滚动区域 -->
    <scroll-view scroll-y="true" class="left-scroll-view" :style="{height:wh+'px'}" >
      <block v-for="(item,i) in cateList" :key="i">
        <view :class="['left-scroll-view-item',i===active?'active':'']" @click="activeChange(i)">{{item.cat_name}}</view>
      </block>
    </scroll-view>
    
    <!-- 右侧滚动区域 -->
    <scroll-view scroll-y="true" class="right-scroll-view" :style="{height:wh+'px'}" 
    :scroll-top="scrollTop">
        <view class="cate-lv2" v-for="(item,i2) in catelevel2" :key="i2">
            <view class="cate-lv2-title">
                / {{item.cat_name}} /
            </view>
            <view class="cate-lv3">
              <view class="cate-lv3-item" v-for="(item3,i3) in item.children" :key="i3" @click="gotoGoodList(item3)">
                <image :src="item3.cat_icon"></image>
                <text>{{item3.cat_name}}</text>
              </view>   
            </view>
        </view>
    </scroll-view>
  </view>
</template>

<script>
  import bageMix from '@/mixins/tabbar-badge.js'
  export default {
    mixins:[bageMix],
    data() {
      return {
        wh:0,
        cateList:[],
        active:0,
        catelevel2:[],
        scrollTop:0
      };
    },
    
    onLoad() {
      //获取当前系统信息
      const sysInfo = uni.getSystemInfoSync()
      //获取可用屏幕高度
      this.wh=sysInfo.windowHeight-50
      //获取分类列表数据的方法
      this.getCateList()
    },
    methods:{
      async getCateList(){
        const {data:res} = await uni.$http.get('/api/public/v1/categories')
        if(res.meta.status !== 200) return uni.$showMsg()
        this.cateList=res.message
        this.catelevel2 = res.message[0].children
      },
      
      activeChange(i){
        this.active=i
        this.catelevel2=this.cateList[i].children
        this.scrollTop= this.scrollTop===0?1:0
      },
      
      gotoGoodList(item){
        console.log(item)
        uni.navigateTo({
          url:`/subpkg/goods_list/goods_list?cid=${item.cat_id}`
        })
      },
      gotoSearch(){
        uni.navigateTo({
           url:"/subpkg/search/search"
        })
      }
    }
  }
</script>

<style lang="scss">
  .scroll-view-container{
    display: flex;
  }
  
  .left-scroll-view{
    width: 120px;
    .left-scroll-view-item{
      line-height: 60px;
      background-color: #f7f7f7;
      text-align: center;
      font-size: 12px;
      //激活的样式
      &.active{
        background-color: #ffffff;
        position: relative;
        //渲染激活项右侧的红色指示边线
        &::before{
          content: ' ';
          display: block;
          width: 3px;
          height: 30px;
          background-color: #c00000;
          position: absolute;
          left: 0;
          top: 50%;
          transform: translateY(-50%)
        }
      }
    }
  }
  
  .cate-lv2-title{
    font-size: 12px;
    font-weight: bold;
    text-align: center;
    padding: 15px 0;
  }
  
  .cate-lv3{
    display: flex;
    flex-wrap: wrap;
    .cate-lv3-item{
      width: 33.33%;
      display: flex;
      flex-direction: column;
      justify-content: center;
      align-items: center;
      image{
        width: 60px;
        height: 60px;
      }
      text{
        font-size: 12px;
      }
    }
  }
</style>
